package com.mall.system.service;

import com.mall.common.annotation.DataScope;
import com.mall.common.constant.UserConstants;
import com.mall.common.core.domain.Ztree;
import com.mall.common.exception.BusinessException;
import com.mall.common.utils.StringUtils;
import com.mall.system.domain.entity.SysDept;
import com.mall.system.domain.entity.SysRole;
import com.mall.system.mapper.SysDeptMapper;
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

/**
 * 部门管理 服务实现
 * Created by zhonglin on 2020/4/8.
 */
@Service
public class SysDeptService {

  @Autowired
  private SysDeptMapper deptMapper;

  /**
   * 查询部门管理数据
   *
   * @param dept 部门信息
   *
   * @return 部门信息集合
   */
  @DataScope(deptAlias = "d")
  public List<SysDept> selectDeptList(SysDept dept) {

    return deptMapper.selectDeptList(dept);
  }

  /**
   * 查询部门管理树
   *
   * @param dept 部门信息
   *
   * @return 所有部门信息
   */
  @DataScope(deptAlias = "d")
  public List<Ztree> selectDeptTree(SysDept dept) {

    List<SysDept> deptList = deptMapper.selectDeptList(dept);
    List<Ztree>   ztrees   = initZtree(deptList);
    return ztrees;
  }

  /**
   * 根据角色ID查询部门（数据权限）
   *
   * @param role 角色对象
   *
   * @return 部门列表（数据权限）
   */
  public List<Ztree> roleDeptTreeData(SysRole role) {

    Long          roleId   = role.getRoleId();
    List<Ztree>   ztrees   = new ArrayList<Ztree>();
    List<SysDept> deptList = selectDeptList(new SysDept());
    if (StringUtils.isNotNull(roleId)) {
      List<String> roleDeptList = deptMapper.selectRoleDeptTree(roleId);
      ztrees = initZtree(deptList, roleDeptList);
    } else {
      ztrees = initZtree(deptList);
    }
    return ztrees;
  }

  /**
   * 对象转部门树
   *
   * @param deptList 部门列表
   *
   * @return 树结构列表
   */
  public List<Ztree> initZtree(List<SysDept> deptList) {

    return initZtree(deptList, null);
  }

  /**
   * 对象转部门树
   *
   * @param deptList     部门列表
   * @param roleDeptList 角色已存在菜单列表
   *
   * @return 树结构列表
   */
  public List<Ztree> initZtree(List<SysDept> deptList,
                               List<String> roleDeptList) {

    List<Ztree> ztrees  = new ArrayList<Ztree>();
    boolean     isCheck = StringUtils.isNotNull(roleDeptList);
    for (SysDept dept : deptList) {
      if (UserConstants.DEPT_NORMAL.equals(dept.getStatus())) {
        Ztree ztree = new Ztree();
        ztree.setId(dept.getDeptId());
        ztree.setpId(dept.getParentId());
        ztree.setName(dept.getDeptName());
        ztree.setTitle(dept.getDeptName());
        if (isCheck) {
          ztree.setChecked(roleDeptList.contains(dept.getDeptId() + dept.getDeptName()));
        }
        ztrees.add(ztree);
      }
    }
    return ztrees;
  }

  /**
   * 查询部门人数
   *
   * @param parentId 部门ID
   *
   * @return 结果
   */
  public int selectDeptCount(Long parentId) {

    SysDept dept = new SysDept();
    dept.setParentId(parentId);
    return deptMapper.selectDeptCount(dept);
  }

  /**
   * 查询部门是否存在用户
   *
   * @param deptId 部门ID
   *
   * @return 结果 true 存在 false 不存在
   */
  public boolean checkDeptExistUser(Long deptId) {

    int result = deptMapper.checkDeptExistUser(deptId);
    return result > 0
        ? true
        : false;
  }

  /**
   * 删除部门管理信息
   *
   * @param deptId 部门ID
   *
   * @return 结果
   */
  public int deleteDeptById(Long deptId) {

    return deptMapper.deleteDeptById(deptId);
  }

  /**
   * 新增保存部门信息
   *
   * @param dept 部门信息
   *
   * @return 结果
   */
  public int insertDept(SysDept dept) {

    SysDept info = deptMapper.selectDeptById(dept.getParentId());
    // 如果父节点不为"正常"状态,则不允许新增子节点
    if (!UserConstants.DEPT_NORMAL.equals(info.getStatus())) {
      throw new BusinessException("部门停用，不允许新增");
    }
    dept.setAncestors(info.getAncestors() + "," + dept.getParentId());
    return deptMapper.insertDept(dept);
  }

  /**
   * 修改保存部门信息
   *
   * @param dept 部门信息
   *
   * @return 结果
   */
  @Transactional
  public int updateDept(SysDept dept) {

    SysDept newParentDept = deptMapper.selectDeptById(dept.getParentId());
    SysDept oldDept       = selectDeptById(dept.getDeptId());
    if (StringUtils.isNotNull(newParentDept) && StringUtils.isNotNull(oldDept)) {
      String newAncestors = newParentDept.getAncestors() + "," + newParentDept.getDeptId();
      String oldAncestors = oldDept.getAncestors();
      dept.setAncestors(newAncestors);
      updateDeptChildren(dept.getDeptId(), newAncestors, oldAncestors);
    }
    int result = deptMapper.updateDept(dept);
    if (UserConstants.DEPT_NORMAL.equals(dept.getStatus())) {
      // 如果该部门是启用状态，则启用该部门的所有上级部门
      updateParentDeptStatus(dept);
    }
    return result;
  }

  /**
   * 修改该部门的父级部门状态
   *
   * @param dept 当前部门
   */
  private void updateParentDeptStatus(SysDept dept) {

    String updateBy = dept.getUpdateBy();
    dept = deptMapper.selectDeptById(dept.getDeptId());
    dept.setUpdateBy(updateBy);
    deptMapper.updateDeptStatus(dept);
  }

  /**
   * 修改子元素关系
   *
   * @param deptId       被修改的部门ID
   * @param newAncestors 新的父ID集合
   * @param oldAncestors 旧的父ID集合
   */
  public void updateDeptChildren(Long deptId,
                                 String newAncestors,
                                 String oldAncestors) {

    List<SysDept> children = deptMapper.selectChildrenDeptById(deptId);
    for (SysDept child : children) {
      child.setAncestors(child.getAncestors()
                              .replace(oldAncestors, newAncestors));
    }
    if (children.size() > 0) {
      deptMapper.updateDeptChildren(children);
    }
  }

  /**
   * 根据部门ID查询信息
   *
   * @param deptId 部门ID
   *
   * @return 部门信息
   */
  public SysDept selectDeptById(Long deptId) {

    return deptMapper.selectDeptById(deptId);
  }

  /**
   * 校验部门名称是否唯一
   *
   * @param dept 部门信息
   *
   * @return 结果
   */
  public String checkDeptNameUnique(SysDept dept) {

    Long deptId = StringUtils.isNull(dept.getDeptId())
        ? -1L
        : dept.getDeptId();
    SysDept info = deptMapper.checkDeptNameUnique(dept.getDeptName(), dept.getParentId());
    if (StringUtils.isNotNull(info) && info.getDeptId()
                                           .longValue() != deptId.longValue()) {
      return UserConstants.DEPT_NAME_NOT_UNIQUE;
    }
    return UserConstants.DEPT_NAME_UNIQUE;
  }

}
